body{
    background-color: #979797;
}

div{
    overflow: hidden;
}


.cl{
    clear: both;
}


.wrapper{
    width: 1000px;
    background-color: #fff222;
    margin: 0 auto ；； 
    /* 水平居中 */
}

.header{
    width: 990px;
    background-color: #929aff;
    margin: 0 auto;
    min-height: 200px;
}


.main{
    width: 990px;
    background-color: #ffffff;
    margin: 0 auto;
}

.footer{
    width: 990px;
    background-color: #c7ff92;
    margin: 0 auto;
    min-height: 100px;
}

.sidebar{
    float: left;
    width: 189px;
    min-height: 600px;
    background-color: #ff77bb;
    padding-left: 10px;
    border-right: 1px dashed #fff222;
}

.content{
    width: 785px;
    min-height: 600px;
    background-color: #15ffff;
    margin-left: 5px;
}